Physics Demonstration Potential Energy to Kinetic Energy Dominic
- Slides: 9
Physics Demonstration Potential Energy to Kinetic Energy Dominic Florin
Potential Energy • A rock on top of a hill has a potential to do work. • The top of the hill is a high energy state and the bottom of the hill is a lower energy state.
Kinetic Energy • If the rock is allowed to roll down the hill, then the potential energy is converted into kinetic energy. • Kinetic energy is the energy that a moving object has.
Conservation of Energy • The Kinetic Energy could then be converted back into potential energy. • The energy can be split into Potential Energy and/or Kinetic Energy
Friction • Most of the time friction will slow the object down • Friction always acts opposite to the direction of motion
For this system the Potential Energy (PE) is going to be exchanged for Kinetic Energy (KE) and this will give the mass some velocity PE=KE M*g*h=1/2*M*v^2 v=(2*g*h)^. 5 g=32. 2 ft/s^2 or 9. 81 m/s^2
• The mass is then cut off of the string at the bottom of the swing. • Next find how long it will take the object to fall from the bottom of the swing to the top of the cup. Y=1/2*g*t^2 t=(2*Y/g)^. 5
• The horizontal displacement will be the velocity multiplied by the time. • D=v*t • This is where the box should be to catch the falling mass. • Good Luck!
• What about using different masses, does that change where the box is placed? • How does the length of string effect the position of the box?
